<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
		<title>按钮悬停动画1</title>
		<style type="text/css">
			html, body {
  color: white;
  background: #323232;
  font-weight: lighter;
}

h1, h2, h3, h4 {
  font-family: "Oswald";
}

.wrapper {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  width: 100vw;
  height: 100vh;
}
.wrapper .row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin: 10px 0;
}
.wrapper h2 {
  font-size: 1.8em;
}

.button {
  position: relative;
  cursor: pointer;
  color: white;
  font-family: "Lato";
  font-size: 1.5em;
  padding: 0.5em 1em 0.65em;
  margin: 0 10px;
}
.button .inner {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.button:nth-of-type(1):before, .button:nth-of-type(1):after, .button:nth-of-type(1) .inner:before, .button:nth-of-type(1) .inner:after {
  background-color: #ffa726;
}
.button:nth-of-type(2):before, .button:nth-of-type(2):after, .button:nth-of-type(2) .inner:before, .button:nth-of-type(2) .inner:after {
  background-color: #26a69a;
}
.button:nth-of-type(3):before, .button:nth-of-type(3):after, .button:nth-of-type(3) .inner:before, .button:nth-of-type(3) .inner:after {
  background-color: #7e57c2;
}
.button:before, .button:after, .button .inner:before, .button .inner:after {
  position: absolute;
  content: "";
  display: block;
  -webkit-transition: -webkit-transform 0.3s;
  transition: -webkit-transform 0.3s;
  transition: transform 0.3s;
  transition: transform 0.3s, -webkit-transform 0.3s;
}
.button.horizontal:before, .button.horizontal:after, .button.both:before, .button.both:after {
  left: 0;
  width: 100%;
  height: 2px;
  -webkit-transform: scaleX(0);
          transform: scaleX(0);
}
.button.horizontal .inner:before, .button.horizontal .inner:after, .button.both .inner:before, .button.both .inner:after {
  top: 0;
  width: 2px;
  height: 100%;
  -webkit-transform: scaleY(0);
          transform: scaleY(0);
}
.button.horizontal .inner:before, .button.both .inner:before {
  left: 0;
}
.button.horizontal .inner:after, .button.both .inner:after {
  right: 0;
}
.button.horizontal .inner:hover:before, .button.horizontal .inner:hover:after, .button.both .inner:hover:before, .button.both .inner:hover:after {
  -webkit-transform: scaleY(1);
          transform: scaleY(1);
}
.button.horizontal:before, .button.both:before {
  top: 0;
}
.button.horizontal:after, .button.both:after {
  bottom: 0;
}
.button.horizontal:hover:before, .button.horizontal:hover:after, .button.both:hover:before, .button.both:hover:after {
  -webkit-transform: scaleX(1);
          transform: scaleX(1);
}
.button.horizontal:hover .inner:before, .button.horizontal:hover .inner:after, .button.both:hover .inner:before, .button.both:hover .inner:after {
  -webkit-transform: scaleY(1);
          transform: scaleY(1);
}
.button.horizontal.clockwise .inner:before, .button.both.clockwise .inner:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.clockwise .inner:after, .button.both.clockwise .inner:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.clockwise:before, .button.both.clockwise:before {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.clockwise:after, .button.both.clockwise:after {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.horizontal.clockwise:hover .inner:before, .button.both.clockwise:hover .inner:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.clockwise:hover .inner:after, .button.both.clockwise:hover .inner:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.clockwise:hover:before, .button.both.clockwise:hover:before {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.horizontal.clockwise:hover:after, .button.both.clockwise:hover:after {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.counterclockwise .inner:before, .button.both.counterclockwise .inner:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.counterclockwise .inner:after, .button.both.counterclockwise .inner:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.counterclockwise:before, .button.both.counterclockwise:before {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.horizontal.counterclockwise:after, .button.both.counterclockwise:after {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.counterclockwise:hover .inner:before, .button.both.counterclockwise:hover .inner:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.counterclockwise:hover .inner:after, .button.both.counterclockwise:hover .inner:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.counterclockwise:hover:before, .button.both.counterclockwise:hover:before {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.counterclockwise:hover:after, .button.both.counterclockwise:hover:after {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.vertical:before, .button.vertical:after {
  top: 0;
  width: 2px;
  height: 100%;
  -webkit-transform: scaleY(0);
          transform: scaleY(0);
}
.button.vertical:before {
  left: 0;
}
.button.vertical:after {
  right: 0;
}
.button.vertical:hover:before, .button.vertical:hover:after {
  -webkit-transform: scaleY(1);
          transform: scaleY(1);
}
.button.vertical.clockwise:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.clockwise:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.vertical.clockwise:hover:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.vertical.clockwise:hover:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.counterclockwise:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.vertical.counterclockwise:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.counterclockwise:hover:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.counterclockwise:hover:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}

.codepen-link {
  position: absolute;
  bottom: 30px;
  right: 30px;
  height: 40px;
  width: 40px;
  z-index: 10;
  border-radius: 50%;
  box-sizing: border-box;
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/544318/logo.jpg");
  background-position: center center;
  background-size: cover;
  opacity: 0.5;
  -webkit-transition: all 0.25s;
  transition: all 0.25s;
}
.codepen-link:hover {
  opacity: 0.8;
  box-shadow: 0 0 6px #efefef;
}

		</style>
	</head>
	<body>
		<div class="wrapper">
  <h2>Clockwise</h2>
  <div class="row">
    <div class="button clockwise horizontal">Horizontal</div>
    <div class="button clockwise vertical">Vertical</div>
    <div class="button clockwise both">Both
      <div class="inner"></div>
    </div>
  </div>
  <h2>Counter-clockwise</h2>
  <div class="row">
    <div class="button counterclockwise horizontal">Horizontal</div>
    <div class="button counterclockwise vertical">Vertical</div>
    <div class="button counterclockwise both">Both
      <div class="inner"></div>
    </div>
  </div>
</div>
	</body>
</html>
